488 Not Acceptable Here. - "Client side general processing error." in lync

ISSUE:  This issue arise when any user make a call to other lync user. In summary when there is a issue of INVITE message transaction. 


WHY?

488 Not Acceptable Here  issue arise due to sdp misconstruction or for invalid sdp.

 Sending:
INVITE sip:demouser@yy.com SIP/2.0
Via: SIP/2.0/TLS x.x.x.x:33360;branch=18n2L9K88eMlGn7CcctT9RwKSB1FebW397VI5uG1
From: <sip:test@xx.local>;tag=1375467581;epid=13754675
To: <sip:demouser@yy.com>
Call-ID: BHQjMXffBDJ3cWfS4CAvb2wTByEnCZT2xxb7jecK
CSeq: 1 INVITE
Contact: <sip:test@xx.local;opaque=user:epid:DbsgHp_PWlGCoMke5u6QsgAA;gruu>
Content-Type: application/sdp
Max-Forwards: 70
Supported: ms-dialog-route-set-update
Supported: timer
Supported: histinfo
Supported: ms-safe-transfer
Supported: ms-sender
Supported: ms-early-media
Supported: 100rel
Supported: replaces
Supported: ms-conf-invite
Ms-keep-alive: UAC;hop-hop=yes
Accept-Language: en-US
P-Preferred-Identity: sip:test@xx.local
Allow: INVITE, BYE, ACK, CANCEL, INFO, UPDATE, REFER, NOTIFY, BENOTIFY, OPTIONS
Ms-endpoint-location-data: NetworkScope;ms-media-location-type=Internet
Authorization: NTLM qop="auth", realm="SIP Communications Service", opaque="514B89F0", targetname="front.local", version=4, crand="13754676", cnum ="4", response="01000000856b490601dda29164000000"
Content-Length:  2867

Content-Type: application/sdp
Content-Transfer-Encoding: 7bit
Content-Disposition: session; handling=optional
v=0
o=WIND 3650253204 3948007207 IN IP4 192.168.0.101
s= Jul 23 2013
c=IN IP4 192.168.0.101
t=0 0
m=audio 41520 TCP RTP/SAVP 0 101
a=ice-pwd:CtCRycRIaDo79slChHL05Z0h
a=ice-ufrag:W2GN
a=candidate:1 1 UDP 2130706175 192.168.0.101 41520 typ host
a=candidate:1 2 UDP 2130706174 192.168.0.101 52623 typ host
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:8G/gOa60WGCt67GKSLFK0oBTHeeLjTL65WzpK+NB|2^31
a=rtcp:37661
a=maxptime:200
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=encryption:optional

Received:

SIP/2.0 488 Not Acceptable Here
Via: SIP/2.0/TLS x.x.x.x:33360;branch=18n2L9K88eMlGn7CcctT9RwKSB1FebW397VI5uG1;received=192.168.0.101;ms-received-port=33360;ms-received-cid=5D100
From: <sip:x.x.x.x:5061;transport=tls>;tag=1375467581;epid=13754675
To: <sip:test@xx.local>;epid=6c823739d0;tag=29db7c0aab
Call-ID: BHQjMXffBDJ3cWfS4CAvb2wTByEnCZT2xxb7jecK
CSeq: 1 INVITE
User-Agent: UCCAPI/4.0.7577.0 OC/4.0.7577.0 (Microsoft Lync 2010)
Ms-client-diagnostics: 52001; reason="Client side general processing error."
Content-Length: 0
CAUSE:

In that case this issue arise more invalid  sdp. From sdp we can see
 m=audio 41520 TCP RTP/SAVP 0 101 ---- Invalid
m=audio 41520 TCP/RTP/SAVP 0 101  ---- Valid

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